An astronaut moves away from earth at a speed of light. If an observer on earth measures the astronaut's size what change would he or she measure? Would the astronaut measures any change?
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Expert's answer
2017-11-24T14:32:06-0500
The speed of astronaut relative earth is at a speed of light. The astronaut's size is L=L_0 √(1-c^2/c^2 )=0. Thus, an observer on earth cannot see astronaut now. Also, the astronaut cannot measure any change because he is situated in his own rest frame.
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